CBSE Class 9 Answered

Q) ANSWER THE FOLLOWING QUESTIONS:- a) WHY MAKING OF ANTIVIRAL IS MORE HARDER THAN ANTI BACTERIAL MEDICINES? B)(i)ASCARIS SPERAD THROUGH______ . (ii)KALAZAR CAUSE BY________ . (iii)LEPROCY IS A ________. (iv)RINGWORM CAUSED BY_______. (v)T.B. CAUSED BY ________. (C)GIVE 5 DIFFERNCES BETWEEN INFECTIOUS AND NON INFECTIOUS DISEASE?

Asked by PAWAN KUMAR | 25 Dec, 2013, 01:00: PM

Expert Answer

a) It is hard to make antiviral medicines because viruses have a high tendency to mutate rapidly and virus don 't have their own cell structure and use the host cell to replicate. Bacteria have their own biochemical pathways and is therefore easy to detect it 's presence in our body. So it is difficult for making antiviral medicine rather than antibacterial medicine.

b)(i) Ascaris is spread through human stool and can be accidentially spred by injesting something that has come in contact with faeces.

(ii) Kala azar (Leishmaniasis) is caused by a parasite which spreads from one person to another through the bite of an infected female sand fly.

(iii) Leprosy is a chronic infectious disease that primarily affects the peripheral nerves, skin, upper respiratory tract, eyes, and nasal mucosa. The disease is caused by a bacillus (rod-shaped) bacterium known as Mycobacterium leprae.

(iv) Ringworm is caused when the bacteria enter the skin through cuts, abrasions or insect bites.

(v) Tuberculosis (TB) is a contagious bacterial infection caused by the bacillus Mycobacterium tuberculosis.
(c)

Infectious Disease	Non- Infectious Disease
(a) They are spread from one person to the other.	(a) They are not spread or contaminated from the others.
(b) The patient can experience a wide variety of symptoms such as fever, headache	(b)In case of non infectious diseases, the symptoms are not always visible.
(c) Examples includes AIDS, cholera, herpes etc.	(c) Examples include heart attacks, strokes, paralysis.
(d) It involves the spread of pathogenic microbial agents, including viruses, bacteria, fungi, protozoa.	(d) They do not involve any microbial agents and not secondary to an organism and are not contagious
(e) They have got vaccines and immunizations for curing.	(e) Non-infectious diseases do not involve any immunization.